Find and replace
A popular utility for applications.
Roly Poly is a classic nursery rhyme for teaching young children opposites such as up and down, big and small, fast and slow. In the rhyme, the word, "up" can be replaced with "big", and the word, "down" replaced with "small" in the second verse.
Make
Write a program that asks the user which word they want to replace in the rhyme: roly poly roly poly up up up roly poly roly poly down down down. The individual words can be stored in a list. All occurances of that word are replaced with a word chosen by the user.
Note: do not use the .replace() method if you are aware of it. You are writing the code that might have been used to make that method.
Use this boilerplate code as a starting point:
Success Criteria
Remember to add a comment before a subprogram, selection or iteration statement to explain its purpose.
Complete the subprogram called `replace` that:
- Takes three parameters: x is the word to be replaced, y is the word to replace x with, and l is a list of words.
- Every occurance of the word x is replaced with the word y.
- Returns the list.
Complete the subprogram called `output` that:
- Takes one parameter, a list of words.
- Outputs all the words in the list, each one on a new line.
Complete the `main program` so that:
- The ryhme is output by calling the `output` subprogram.
- The user can input which word to replace.
- The user can input the new word.
- The `replace` subprogram is called to replace the word in the list.
- The new ryhme is output by calling the `output` subprogram.
Typical inputs and outputs from the program would be:
roly
poly
roly
poly
up
up
up
roly
poly
roly
poly
down
down
down
Which word to replace? :up
Replace with what? :big
roly
poly
roly
poly
big
big
big
roly
poly
roly
poly
down
down
down
Knowledge Organiser
Use these resources as a reference to help you meet the success criteria.
Programming guide:
Flowcharts:
Parsons:
Evaluate
Run the unit tests below to check that your program has met the success criteria.
Which word to replace? :down
Replace with what? :slow
roly
poly
roly
poly
up
up
up
roly
poly
roly
poly
slow
slow
slow
Which word to replace? :down
Replace with what? :small
roly
poly
roly
poly
up
up
up
roly
poly
roly
poly
small
small
small
Which word to replace? :up
Replace with what? :big
roly
poly
roly
poly
big
big
big
roly
poly
roly
poly
down
down
down
Which word to replace? :up
Replace with what? :fast
roly
poly
roly
poly
fast
fast
fast
roly
poly
roly
poly
down
down
down
Check that you have:
- Used comments within the code to describe the purpose of subprograms, conditions and iterations.
- Used meaningful identifier names. That means the names of subprograms and variables indicate what they are for.